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A 454 g block of lead is at an initial temperature of 22.5 degrees Celsius. Define what will be the temperature of the lead after it absorbs 422 kJ of heat from its surroundings?
what will be the percentage (%) of final solution after mixing 20% 200 gram NaCl solution with 50% 100 gram NaCl solution and addition of 200 gram water into the mixture
Procaine hydrochloride (M = 272.77 g/mol) is used as a local anesthetic. Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL
a mixture of aluminum and zinc has a mass 2.30g. excess hcl is added to the mixture and 2.30l of h2 hydrogen gas was
Assume that an air conditioner consumes 1.50 X 103 W of electrical power, and that it can be idealized as a reversible Carnot refrigerator. If the coefficient of performance of this device is 2.50, how much heat can be extracted from the house in ..
the research and development unit of a chemical company is studying the reaction of ch4 and h2s two components of
If the average human body discharges 536 g of CO2 per day, how much NaOH is needed each day for each person in the spacecraft? Answer in units of mol.
A 6.11 g sample of Cu---Zn alloy reacts with excess aqueous HCl producing 1.26 L of H2(g) at 22.0 degrees C and 728 torr. Since only the Zn portion of the alloy reacts, calculate the percent Cu in the alloy.
A sample of gas has a density of 1.25 g/dm at 30 degrees C and 1.02x10^5 Pa. What is the molecular mas of this gas?
In the one that minimizes the formal charge, how many double bonds does the chlorine atom make? How many double bonds does each N2O5 resonance structures have
When a solution of a certain gadolinium salt ie electrolyzed with current of 1.0 A for 2.0 h, 0.025 mol of Gd metal forms. Calculate the charge on the gadolinium ion in the salt
A Cr^{3 + } aq solution is electrolyzed, using a current of 7.50 A}. What mass of Cr}( s) is plated out after 1.80 days? also What amperage is required to plate out 0.300 mol Cr from a Cr^{3 + } solution in a period of 7.20 h
Many hunting dogs enjoy standing nose-to-nose with a skunk while barking furiously, oblivious to the skunk spray directed towards them. One moderately effective way of lessening the amount of odor is to wash the dog in a bath containing dilute hyd..
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